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"Type: United States of America. Illinois, Michaux (holo: P-Michaux n.v., fiche at BRI!; ios: P-JU n.v., fiche at BRI!)."

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"It is reported as being sparingly naturalised in agricultural land in southern New South Wales south of Collie. ... I have seen only the cited specimen and it needs to be determined if this plant is still naturalised in Australia."